Kaltura_Client_Exception thrown

Invalid KS "ZGIwYmY3MzBmNjVkYjUxODUyMmM3N2VlZjUzN2Y0YTQxNzE3ZWZkZXwxMDE7OzE0NzUwNzc4MDU7MjsxNDc0OTkxNDA1LjI4ODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"